Brake-shoe.



c. w; ARMBRUST.

BRAKE SHOE.

APPLlCATiON FILED MAY19. 1916- Lm. Patented Feb. 6,1917.

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lil'NliTEU STATS PATENT @FFFGE CHARLES W'. ARMIBRUST, OF CHICAGO, l'IiLIN 01S, ASSIGNOR, BY MESNE ASSIGNMENTS,

T 'EI-IE AMERICAN BRAKE-SHOE & FOUNDRY COMPANY, WARE, A CORPORATION 0F DELAWARE.

0F WILMINGTON, DELA- BRAKE-SIEGE.

Speclcation of Letters Patent.

Patented Feb. 6, i3d?.

Original application filed February 19, 1916, Serial No. 79,236. Divided and this application filed May 18, 1916. Serial No. 98,539.

To all whom it may concern."

Be it known that I, CHARLES W. ARM- BnUsT, a citizen of the United States, residing at Chicago, in the county of Cook 5 and State of Illinois, have invented a certain new and useful Improvement in Brake- Shoes, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specilication.

My invention relates to brake shoes and has for its object the provision of an improved brake shoe structure having reterence particularly to the so-called back plate with which the shoe proper is associated.

This application is a division of my prior application Serial No. 79,236, filed Feb. 19, 1916.

My invention herein contemplates more particularly the provision of a back plate provided with a key lug so arranged that strengthening means for the back plate are provided underneath the lug. My invention further contemplates the provision of a back plate made of two tongues drawn from the body of the metal, preferably longitudinally thereof.

l will explain my invention more in detail by referring to the accompanying drawing illustrating one embodiment thereof, in which- Figure l is a top view of a blank used in the formation of my improved back;

Fig. 2 is a perspective view illustrating the formed back, and

Fig. 3 shows the association of my improved back with a shoe.

Referring more particularly to Fig. 3, l show a brake head 1 which is adapted to hold the brake shoe 2, there being a key 3 to hold the parts together. My improved back d is shown in dotted lines in this figure. This improved back, as shown more clearly in Figs. 1 and 2 comprises the body portion 5 through which suitable holes 6, 6 may be cut to permit the metal of the shoe to flow therethrough for fastening purposes. Two tongues 7, 7 are drawn from the body portion 5 to form the key lug, as shown more clearly in Fig. 2. The tongues are provided with coperating incisions 8, 8 and 9, 9 to accommodate the key 3. Suitable holes 10, 10 are provided to more thoroughly permit a union between the shoe and the back. 55

it will be seen that in the shoe thus formed there is provided a strengthening rib l1 underneath the lug which at the same time gives a continuity to the body and thus increases its strength. The body portion in that part thereof from which the tongues are drawn thus consists of three straps l1, l2 and 13, having the general contour or outline of the body part itself, that is, being merely in the customary arcuate form. In this way a very strong and substantial back is provided having ample means for securing the back to the shoe. Provisions are properly made for accommodating the key, as readily apparent.

From the description thus given my invention will be readily clear to those skilled in the art, and it will also be clear that many modifications may be made within the scope of the appended claims without departing from the spirit of my said invention. Having however thus described one form which my invention may take, what claim as new and desire to secure by Letters Patent is: l. A back for a brake shoe consisting of a body strip provided with a centrally located key lug whose three sides are formed of two tongues drawn from the body oi said strip in the same direction.

2. A back for a brake shoe consisting of a body strip provided with a key lug formed of two tongues drawn in the same direction from the body oi said strip from either end to a point beyond the center of said strip. 3. A back for a brake shoe provided with a key lug, said key lug consisting of two fingers formed out of the body of the back, each forming a portion of said lug, and each having a cut-away portion to form a part of the key slot, said fingers being drawn in the same direction and forming the complete key lug. y

4. A back for a brake shoe provided with a key lug, said key lug consisting of two ngers drawn in the same direction out of the body of the back, each of the said fingers forming a portion oi the key lug, and both together forming the complete key lug.

5. A back for a brake shoe provided with a key lug, said key lug consisting of two fingers drawn in the same direction out of the body of the back, each of the said fingers forming n portion of the key lug, and both together forming the complete key lug, the material between Said fingers and on both sides thereof forming three strips adapted to held the back and shoe together.

6v. A back for a brake shoe provided with L key lug, seid key lug consisting of two iingers drawn in the saine direction out of the body of the back, each of the said fingers forming a portion of the key luO' and both together forming the complete key lug, and holes in one extremity of said back adapted to permit east metal of the Shoe to ioW'y therethrough.

7. A back for :t brake shoe provided with n, key lug, said key lug consisting of two fingers drawn in the same direction out of the body or' the back, each ot the said ingers -forming :L portion of the key lug, and both together forming the complete key lug, the material between said fingers and on both sides thereogtI forming three strips adapted to hold the back and shoe together7 and Gopiel of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, 1D. G. 

